platform/x86: dell-wmi-sysman: Make kobj_type structure constant

Since commit ee6d3dd4 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definition to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230207-kobj_type-pdx86-v1-1-8e2c4fb83105@weissschuh.netReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/dell/dell-wmi-sysman/sysman.c

@@ -255,7 +255,7 @@ static void attr_name_release(struct kobject *kobj)
 	kfree(kobj);
 }
 
-static struct kobj_type attr_name_ktype = {
+static const struct kobj_type attr_name_ktype = {
 	.release	= attr_name_release,
 	.sysfs_ops	= &wmi_sysman_kobj_sysfs_ops,
 };